mirror of
https://github.com/c9s/bbgo.git
synced 2024-11-23 15:25:14 +00:00
34 lines
477 B
Go
34 lines
477 B
Go
|
package util
|
||
|
|
|
||
|
|
import (
|
||
|
|
"sync"
|
||
|
|
"sync/atomic"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Reonce struct {
|
||
|
|
done uint32
|
||
|
|
m sync.Mutex
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *Reonce) Reset() {
|
||
|
|
o.m.Lock()
|
||
|
|
atomic.StoreUint32(&o.done, 0)
|
||
|
|
o.m.Unlock()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *Reonce) Do(f func()) {
|
||
|
|
if atomic.LoadUint32(&o.done) == 0 {
|
||
|
|
// Outlined slow-path to allow inlining of the fast-path.
|
||
|
|
o.doSlow(f)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *Reonce) doSlow(f func()) {
|
||
|
|
o.m.Lock()
|
||
|
|
defer o.m.Unlock()
|
||
|
|
if o.done == 0 {
|
||
|
|
defer atomic.StoreUint32(&o.done, 1)
|
||
|
|
f()
|
||
|
|
}
|
||
|
|
}
|